CN104411035A - LED drive circuit without auxiliary winding for power supply - Google Patents
LED drive circuit without auxiliary winding for power supply Download PDFInfo
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- CN104411035A CN104411035A CN201410551217.1A CN201410551217A CN104411035A CN 104411035 A CN104411035 A CN 104411035A CN 201410551217 A CN201410551217 A CN 201410551217A CN 104411035 A CN104411035 A CN 104411035A
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Abstract
The present invention relates to an LED drive circuit without an auxiliary winding for power supply. By detecting the change in the drain voltage of a power switch MOS transistor relative to a reference voltage, the zero-crossing time of the current of a fly-wheel diode is determined, so that the turn-off time of the fly-wheel diode is obtained, and the average current of an LED load is detected, thereby achieving constant current driving of the LED. According to the invention, the auxiliary winding is designed to be omitted, so that the design of the LED drive power source is simplified, the size of the LED drive power source is reduced, and the cost of the LED drive power source is lowered.
Description
Technical field
The present invention relates to LED Driving technique field, particularly relate to a kind of LED drive circuit without the need to auxiliary winding power.
Background technology
Fig. 1 is traditional rough schematic view without auxiliary winding power LED drive circuit.As shown in Figure 1, rectifier bridge, constant-current control circuit, capacitor C1, capacitor C2, capacitor C3, resistance R1, resistance R2, resistance R3, inductance L 1, diode D1, diode D2 is mainly comprised.
The powered operation of constant-current drive circuit shown in Fig. 1 principle is as follows: after constant-current drive circuit powers on, input voltage is charged to electric capacity C2 by resistance R1, after the voltage charged on electric capacity C2 is greater than the cut-in voltage of constant-current control circuit, constant-current control circuit is started working, when after constant-current drive circuit steady operation, when low tension switch MOS transistor M2 opens, power switch MOS transistor M1 also conducting, voltage rise on sampling resistor R2, when the voltage on sampling resistor R2 reaches predetermined threshold value, switch control logic circuitry output signal makes low tension switch MOS transistor M2 close, power switch MOS transistor M1 also closes simultaneously, feedback stream diode D2 conducting, the source voltage of power switch MOS transistor M1 is made to be clamped to VCC, sustained diode 1 starts conducting simultaneously, electric current in switching tube rises to peak value very soon and starts to decline, when the electric current of sustained diode 1 drops to zero, the drain voltage of power switch MOS transistor M1 also starts to decline, due to the drain electrode of M1 and the capacitive coupling effect of source electrode, the source voltage of power switch MOS transistor M1 starts to decline simultaneously, by comparing grid and the source voltage values of power switch MOS transistor M1, thus obtain the turn-off time of sustained diode 1, thus systems axiol-ogy is to the average current of LED load, the moment is opened what controlled low tension switch MOS transistor M2 by switch control logic circuitry, thus realize the object of LED constant current driving.
Above-mentioned traditional without the need in the non-isolated LED drive circuit of auxiliary winding power, there are following two shortcomings:
The first, the power MOS switch tube (M1) of sampling source drive, because superpose with the low-voltage driving metal-oxide-semiconductor (M2) in path, so need less conducting resistance, the loss that guarantee drive circuit is lower and higher efficiency.Conducting resistance is less, and cost can be higher undoubtedly.
Second, because to detect fly-wheel diode electric current be the method in zero moment is grid by comparing power MOS switch tube (M1) and source voltage, and this method is difficult to zero crossing accurately be detected, debug process is very difficult and trouble also, therefore greatly can affect Time To Market and the rate of finished products of product.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of LED drive circuit without the need to auxiliary winding power, can improve the performance of LED drive power, simplifies the design of LED drive power, reduces LED drive power volume, reduces LED drive power cost.
The technical solution adopted for the present invention to solve the technical problems is: provide a kind of LED drive circuit without the need to auxiliary winding power, comprise: be connected to the first capacitor between input direct voltage and ground, and be connected in parallel on the first resistance be connected in series and second capacitor at described first capacitor two ends, also comprise voltage sample network, voltage reference produces circuit, voltage comparator, power switch metal-oxide-semiconductor, feedthrough diode and feedthrough electric capacity, the negative pole of described feedthrough diode is connected between described first resistance and the second capacitor, positive pole is connected with one end of described feedthrough electric capacity, the other end of described feedthrough electric capacity is connected with the drain electrode of described power switch metal-oxide-semiconductor, between the positive pole that the input of described voltage sample network is connected to described feedthrough diode D2 and feedthrough electric capacity, output is connected to the first input end of voltage comparator, for obtaining the drain voltage of described power switch MOS transistor, described voltage reference produces the second input of the output connection voltage comparator of circuit, for judging that power switch metal-oxide-semiconductor drain voltage change provides reference voltage, the output of described voltage comparator is connected by the grid of switch control logic circuitry with described power switch metal-oxide-semiconductor, for drain voltage and the reference voltage of the power switch metal-oxide-semiconductor of comparative voltage sampling network acquisition, when the Output rusults generation saltus step of described voltage comparator, obtain the switch off current moment of fly-wheel diode, the drain electrode of described power switch metal-oxide-semiconductor is connected to the positive pole of magnetic couplings device and the fly-wheel diode be connected with load, and source electrode is connected to one end of sampling resistor, described sampling resistor other end ground connection.
Described voltage sample network is by resistance and resistance, or electric capacity and electric capacity, or resistance and capacitor combination form.
Described drive circuit also comprises overvoltage protection logical circuit; An input of described overvoltage protection logical circuit connects the output of described voltage comparator; another input connects minimum time of afterflow timing circuit; when described overvoltage protection logical circuit detects that the ON time of fly-wheel diode is less than default minimum ON time, described overvoltage protection logical circuit is triggered.
An input of described switch control logic circuitry connects the output of described voltage comparator, and another input connects the source electrode of described power switch metal-oxide-semiconductor, and output connects the grid of described power switch metal-oxide-semiconductor; When the voltage on described sampling resistor reaches predetermined threshold value, described switch control logic circuitry output signal makes described power switch MOS transistor close; When the Output rusults generation saltus step of described voltage comparator, when obtaining the switch off current moment of fly-wheel diode, according to the average current of load, what described switch control logic circuitry output signal controlled described power switch metal-oxide-semiconductor opens the moment.
Described load two ends are also parallel with the 3rd electric capacity.
Described magnetic couplings device is inductance, and described inductance and described load are connected in parallel or are connected in series.
Described magnetic couplings device is transformer, and the secondary of described transformer forms loop through described fly-wheel diode and load.
Described fly-wheel diode is connected in parallel on load two ends or and load in series.
Beneficial effect
Owing to have employed above-mentioned technical scheme, the present invention compared with prior art, has following advantage and good effect:
The present invention in terms of existing technologies, the drain voltage and the canonical reference voltage that voltage sample network are detected to the power switch MOS transistor obtained compare, the electric current obtaining sustained diode 1 according to comparative result was zero moment, thus determine the turn-off time of sustained diode 1, the average current of LED load detected, realize LED constant current and drive; Save the design of auxiliary winding, improve the performance of LED drive power, simplify the design of LED drive power, reduce LED drive power volume, reduce LED drive power cost.
The present invention is also provided with overvoltage protection logical circuit, is designed by simple overvoltage protection, can, when LED drive circuit output open circuit, prevent output voltage too high.
The present invention, also by feedthrough electric capacity, is obtained electric current from the drain electrode of power switch MOS transistor and is powered to control circuit by feedback stream diode, can be reduced the electric current on supply access, make the lower power consumption of drive circuit.
In addition, the magnetic couplings device that in the present invention, LED load connects can be inductance, and also can be transformer, provide the multiple connected modes such as isolated form, non-isolation type step-down or buck for LED drive circuit, implementation be flexible.
Accompanying drawing explanation
Fig. 1 is traditional auxiliary winding L ED constant-current drive circuit schematic diagram of nothing;
Fig. 2 is connected in series schematic diagram according to first embodiment of the invention without the need to the LED drive circuit of auxiliary winding and the non-isolation type of LED load;
Fig. 3 is connected in parallel schematic diagram according to first embodiment of the invention without the need to the LED drive circuit of auxiliary winding and the non-isolation type of LED load;
Fig. 4 be according to first embodiment of the invention without the need to sampling network schematic diagram in the LED drive circuit of auxiliary winding;
Fig. 5 is voltage or the electric current output schematic diagram of each signaling point in the LED drive circuit without the need to auxiliary winding according to first embodiment of the invention.
embodiment
Below in conjunction with specific embodiment, set forth the present invention further.Should be understood that these embodiments are only not used in for illustration of the present invention to limit the scope of the invention.In addition should be understood that those skilled in the art can make various changes or modifications the present invention, and these equivalent form of values fall within the application's appended claims limited range equally after the content of having read the present invention's instruction.
First execution mode of the present invention relates to a kind of LED drive circuit without the need to auxiliary winding power, as shown in Figure 2, comprise: be connected to the first capacitor C1 between input direct voltage and ground, and be connected in parallel on the first resistance R1 be connected in series and the second capacitor C2 at described first capacitor C1 two ends, also comprise voltage sample network 202, voltage reference produces circuit 203, voltage comparator 201, power switch metal-oxide-semiconductor M1, feedthrough diode D2 and feedthrough electric capacity C4, the negative pole of described feedthrough diode D2 is connected between described first resistance R1 and the second capacitor C2, positive pole is connected with one end of described feedthrough electric capacity C4, the other end of described feedthrough electric capacity C4 is connected with the drain electrode of described power switch metal-oxide-semiconductor M1, between the positive pole that the input of described voltage sample network 202 is connected to described feedthrough diode D2 and feedthrough electric capacity C4, output is connected to the first input end of voltage comparator 201, for obtaining the drain voltage of described power switch MOS transistor M1, described voltage reference produces the second input of the output connection voltage comparator 201 of circuit 203, for judging that power switch metal-oxide-semiconductor M1 drain voltage change provides reference voltage, the output of described voltage comparator 201 is connected with the grid of described power switch metal-oxide-semiconductor M1 by switch control logic circuitry 204, for drain voltage and the reference voltage of the power switch metal-oxide-semiconductor M1 of comparative voltage sampling network acquisition, when the Output rusults generation saltus step of described voltage comparator 201, obtain the switch off current moment of sustained diode 1, the drain electrode of described power switch metal-oxide-semiconductor M1 is connected to the positive pole of magnetic couplings device and the sustained diode 1 be connected with load, and source electrode is connected to one end of sampling resistor R2, described sampling resistor R2 other end ground connection.Its method is the drain voltage by voltage sample network 202 detection power switch mos transistor; The drain voltage detected and canonical reference voltage are compared, obtains the switch off current moment of sustained diode 1 according to comparative result.
Adopt the mode of feedthrough electric capacity feed to power to constant-current control circuit in above-mentioned execution mode, make the supply current needed for constant-current control circuit less, power supply circuits only comprise resistance and electric capacity two components and parts, are conducive to reducing costs and reduce package size; And the resistance in power supply circuits can be comparatively large, electric capacity can be less, is conducive to the efficiency improving drive circuit.
It is made improvement to the type of drive of existing drive circuit as shown in Figure 1 and control mode that above-mentioned execution mode relates to a kind of LED drive circuit without the need to auxiliary winding.Similar with prior art: the first capacitor C1 in parallel between input source DC side with circuit ground, be connected in series the first resistance R1 and the second capacitor C2, one end of inductance L 1 is connected between the drain electrode of fly-wheel diode anode and power switch MOS transistor M1, the inductance other end is connected to the 3rd capacitor and LED load, 3rd capacitor C3 is filter capacitor, is parallel to LED load two ends.
And unlike the prior art: present embodiment adopts different sampling networks to obtain power switch MOS transistor M1 drain voltage and normal voltage compares, thus more easily obtain the current over-zero test point of more accurate fly-wheel diode, adopt the mode of feedthrough electric capacity feed to power to control circuit in addition.
Wherein, the input of voltage sample network is connected to the drain electrode of power switch MOS transistor M1, and output connects the first input end of voltage error comparator 201, for the drain voltage of detection power switch mos transistor M1.
The output of reference voltage circuit (203 reference voltage circuits namely in Fig. 2) is connected to the second input of voltage error comparator 201, for as the reference voltage judging fly-wheel diode current zero-crossing point;
Voltage error comparator 201, for the sampled value of comparative voltage sampling network and canonical reference magnitude of voltage, when the Output rusults generation saltus step of described voltage error comparator, obtains the current over-zero moment of sustained diode 1.
In addition, it will be understood by those skilled in the art that voltage sample network can by resistance and resistance, or electric capacity and electric capacity, or resistance and capacitor combination are formed, Fig. 4 is described voltage sample network.
As can be seen here, embodiment of the present invention in terms of existing technologies, the drain voltage and the canonical reference voltage that voltage sample network are detected to the power switch MOS transistor obtained compare, the electric current obtaining sustained diode 1 according to comparative result was zero moment, thus determine the turn-off time of sustained diode 1, the average current of LED load detected, realize LED constant current and drive; Save the design of auxiliary winding, improve the performance of LED drive power, simplify the design of LED drive power, reduce LED drive power volume, reduce LED drive power cost.
In addition, the LED drive circuit of present embodiment also comprises switch control logic circuitry, power switch MOS transistor M1 and sampling resistor R2, the positive pole of fly-wheel diode is received in the drain electrode of this power switch MOS transistor M1, source electrode is connected to one end of sampling resistor R2, one end ground connection of sampling resistor R2, the grid of power switch MOS transistor M1 is controlled by switch control logic circuitry 204; An input of two switch control logic circuitry 204 connects the output of voltage error comparator 201, and an acquaintance holds the source electrode connecting sampling resistor R2 and power switch MOS transistor M1, and output connects the grid of power switch MOS transistor M1.
The course of work of LED drive circuit is according to the present embodiment specifically described below in conjunction with Fig. 2 and Fig. 5:
When power switch MOS transistor M1 conducting, electric current in inductance L 1 rises, voltage on sampling resistor R2 also rises (401 moment namely in Fig. 5 residing for CS), when the voltage on sampling resistor R2 reaches predetermined threshold value time (i.e. 402 moment residing for CS in Fig. 5), switch control logic circuitry 204 output signal makes power switch MOS transistor M1 close, sustained diode 1 conducting, and rise to peak value very soon and start slowly to decline (402 moment namely in Fig. 5 residing for CS), when the electric current of sustained diode 1 drops to zero (in Fig. 5 403 moment residing for I_D1), the drain voltage of power switch MOS transistor M1 starts quick decline, when voltage drop is to during lower than canonical reference voltage, voltage error comparator overturns, obtain the turn-off time of sustained diode 1, thus system can detect the average current of LED load, what control power switch MOS transistor M1 by switch control logic circuitry 204 again opens the moment, thus realize the object of LED constant current driving.
Composition graphs 2 and Fig. 5 can find out, the output voltage values of voltage sample network 202 is the drain voltage of power switch MOS transistor M1, the output valve of reference voltage circuit is canonical reference voltage, when the drain voltage of power switch MOS transistor M1 is lower than moment 403 of canonical reference voltage the moment that fly-wheel diode electric current drops to zero, therefore voltage sample network and the reference voltage circuit of present embodiment can be adopted, and voltage error comparator detects this moment, thus obtain the turn-off time of sustained diode 1.
In addition, the LED drive circuit of present embodiment also comprises the overvoltage protection logical circuit 206 for carrying out overvoltage protection to LED drive circuit, an input of this overvoltage protection logical circuit 205 connects the output of voltage sample network comparator 201, another input connects minimum time of afterflow timing circuit 206, when overvoltage relay protective scheme circuit 205 detect the ON time of sustained diode 1 be less than one preset minimum time of afterflow time, overvoltage protection logical circuit is triggered, wherein, the ON time of sustained diode 1 obtains according to the Output rusults of voltage error comparator.By above-mentioned simple overvoltage protection design, can, when LED drive circuit output open circuit, prevent output voltage too high.
In the present embodiment, sustained diode 1 and LED load form loop, and at LED load two ends parallel connection the 3rd capacitor C3, for filtering.
Inductance L 1 is connected in series shown in (as Fig. 2) in the present embodiment, also can be connected in parallel (as shown in Figure 3).
Second execution mode of the present invention relates to a kind of LED drive circuit without the need to auxiliary winding.Second execution mode is roughly the same with the first execution mode, and main distinction part is: in the first embodiment, and the connected mode of LED drive circuit and LED load is non-isolation type.And in second embodiment of the invention, the connected mode of LED drive circuit and LED load is isolated form.
Specifically, the design of the driving of the power switch MOS transistor of present embodiment, voltage sample network, Drive and Control Circuit and too protective circuit is all identical with the first execution mode, and its course of work is also identical, does not repeat them here.Difference is: the magnetic couplings device be connected with LED load is in the first embodiment inductance L 1, and the magnetic couplings device be connected with LED load in present embodiment is transformer T1.
Be not difficult to find, the invention provides the constant current LED drive circuit that a kind of nothing assists winding power, this drive circuit is by Direct driver power switch MOS transistor, and the technology of feedthrough capacitances to supply power simplifies circuit, reduce cost, improve the realizability of circuit.
Claims (8)
1. the LED drive circuit without the need to auxiliary winding power, comprise: be connected to the first capacitor (C1) between input direct voltage and ground, and be connected in parallel on the first resistance (R1) be connected in series and second capacitor (C2) at described first capacitor (C1) two ends, it is characterized in that, also comprise voltage sample network (202), voltage reference produces circuit (203), voltage comparator (201), power switch metal-oxide-semiconductor (M1), feedthrough diode (D2) and feedthrough electric capacity (C4), the negative pole of described feedthrough diode (D2) is connected between described first resistance (R1) and the second capacitor (C2), positive pole is connected with one end of described feedthrough electric capacity (C4), the other end of described feedthrough electric capacity (C4) is connected with the drain electrode of described power switch metal-oxide-semiconductor (M1), between the positive pole that the input of described voltage sample network (202) is connected to described feedthrough diode (D2) and feedthrough electric capacity (C4), output is connected to the first input end of voltage comparator (201), for obtaining the drain voltage of described power switch MOS transistor (M1), described voltage reference produces the second input of output connection voltage comparator (201) of circuit (203), for judging that power switch metal-oxide-semiconductor (M1) drain voltage change provides reference voltage, the output of described voltage comparator (201) is connected with the grid of described power switch metal-oxide-semiconductor (M1) by switch control logic circuitry (204), for drain voltage and the reference voltage of the power switch metal-oxide-semiconductor (M1) of comparative voltage sampling network acquisition, when the Output rusults generation saltus step of described voltage comparator (201), obtain the switch off current moment of fly-wheel diode (D1), the drain electrode of described power switch metal-oxide-semiconductor (M1) is connected to the positive pole of magnetic couplings device and the fly-wheel diode (D1) be connected with load, source electrode is connected to one end of sampling resistor (R2), described sampling resistor (R2) other end ground connection.
2. the LED drive circuit without the need to auxiliary winding power according to claim 1, is characterized in that, described voltage sample network (202) is by resistance and resistance, or electric capacity and electric capacity, or resistance and capacitor combination form.
3. the LED drive circuit without the need to auxiliary winding power according to claim 1, is characterized in that, also comprises overvoltage protection logical circuit (205); An input of described overvoltage protection logical circuit (205) connects the output of described voltage comparator (201); another input connects minimum time of afterflow timing circuit (206); when described overvoltage protection logical circuit (205) detects that the ON time of fly-wheel diode (D2) is less than default minimum ON time, described overvoltage protection logical circuit (205) is triggered.
4. the LED drive circuit without the need to auxiliary winding power according to claim 1, it is characterized in that, an input of described switch control logic circuitry (204) connects the output of described voltage comparator (201), another input connects the source electrode of described power switch metal-oxide-semiconductor (M1), and output connects the grid of described power switch metal-oxide-semiconductor (M1); When the voltage on described sampling resistor (R2) reaches predetermined threshold value, described switch control logic circuitry (204) output signal makes described power switch MOS transistor (M1) close; When the Output rusults generation saltus step of described voltage comparator (201), when obtaining the switch off current moment of fly-wheel diode (D1), according to the average current of load, described switch control logic circuitry (204) output signal control described power switch metal-oxide-semiconductor (M1) open the moment.
5. the LED drive circuit without the need to auxiliary winding power according to claim 1, is characterized in that, described load two ends are also parallel with the 3rd electric capacity (C3).
6. the LED drive circuit without the need to auxiliary winding power according to claim 1, is characterized in that, described magnetic couplings device is inductance (L1), and described inductance (L1) and described load are connected in parallel or are connected in series.
7. the LED drive circuit without the need to auxiliary winding power according to claim 1, it is characterized in that, described magnetic couplings device is transformer (T1), and the secondary of described transformer (T1) forms loop through described fly-wheel diode (D1) and load.
8. the LED drive circuit without the need to auxiliary winding power according to claim 1, is characterized in that, described fly-wheel diode (D1) is connected in parallel on load two ends or and load in series.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410551217.1A CN104411035B (en) | 2014-10-16 | 2014-10-16 | A kind of LED drive circuit powered without assists winding |
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| CN201410551217.1A CN104411035B (en) | 2014-10-16 | 2014-10-16 | A kind of LED drive circuit powered without assists winding |
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| CN104411035B CN104411035B (en) | 2017-06-06 |
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| CN107041040A (en) * | 2017-05-24 | 2017-08-11 | 深圳市稳先微电子有限公司 | A kind of simplex winding LED drive circuit and LED drive device |
| CN107134250A (en) * | 2017-03-30 | 2017-09-05 | 深圳市天微电子股份有限公司 | Emitting diode display device and its light emitting diode display circuit |
| CN107621847A (en) * | 2017-09-19 | 2018-01-23 | 中颖电子股份有限公司 | One kind pull-up accelerating circuit |
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| CN104411035B (en) | 2017-06-06 |
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Effective date of registration: 20220919 Address after: Room 922, Building 2, No. 111 Xiangke Road, China (Shanghai) Pilot Free Trade Zone, Pudong New Area, Shanghai, 201210 Patentee after: Shanghai Fumanduo Semiconductor Co.,Ltd. Address before: 315336 No. 77 Binhai Second Road, Hangzhou Bay New Area, Ningbo City, Zhejiang Province Patentee before: NINGBO XINCHEN MICROELECTRONICS Co.,Ltd. |
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